This reimplements integer variable detection as two parts. The first one
is a visitor class that recursively searches for all declared variables
in a formula and applies the second part, a custom functor.
Two such functors are implemented. The first one checks whether a
predicate definition is falsified by making a variable noninteger, in
which case it can be concluded that the variable in question is integer.
The second functor checks whether bound variables in a quantified
formula turn the quantified part false, again to conclude that variables
are integer.
Patrick Lühne
f65d4dbbd8
